public static void MakeThumNail(string originalImagePath,string thumNailPath,int width, int height, string model)
{
//System.Drawing.Image originalImage = System.Drawing.Image.FromFile(originalImagePath);
Bitmap originalImage =(Bitmap)Bitmap.FromFile(originalImagePath);
int thumWidth = width;//缩略图的宽度
int thumHeight = height; //缩略图的高度
int x = 0; int y = 0;
int originalWidth = originalImage.Width;//原始图片的宽度
int originalHeight = originalImage.Height;//原始图片的高度
switch (model)
{
case "HW": //指定高宽缩放,可能变形
break;
case "W": //指定宽度,高度按照比例缩放
thumHeight = originalImage.Height * width / originalImage.Width;
break;
case "H": //指定高度,宽度按照等比例缩放
thumWidth = originalImage.Width * height / originalImage.Height;
break;
case "Cut":
if ((double)originalImage.Width / (double)originalImage.Height > (double)thumWidth / (double)thumHeight)
{
originalHeight = originalImage.Height;
originalWidth = originalImage.Height * thumWidth / thumHeight; y = 0; x = (originalImage.Width - originalWidth) / 2;
}
else
{
originalWidth = originalImage.Width;
originalHeight = originalWidth * height / thumWidth; x = 0;
y = (originalImage.Height - originalHeight) / 2;
}
break;
default:
break;
} //新建一个bmp图片
System.Drawing.Image bitmap = new System.Drawing.Bitmap(thumWidth, thumHeight); //新建一个画板
System.Drawing.Graphics graphic = System.Drawing.Graphics.FromImage(bitmap); //设置高质量查值法
graphic.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; //设置高质量,低速度呈现平滑程度
graphic.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; //清空画布并以透明背景色填充
graphic.Clear(System.Drawing.Color.Transparent); //在指定位置并且按指定大小绘制原图片的指定部分
graphic.DrawImage(originalImage, new System.Drawing.Rectangle(0, 0, thumWidth, thumHeight), new System.Drawing.Rectangle(x, y, originalWidth, originalHeight),
System.Drawing.GraphicsUnit.Pixel);
originalImage.Dispose();
graphic.Dispose();
GC.Collect();
try
{
bitmap.Save(thumNailPath, System.Drawing.Imaging.ImageFormat.Jpeg);
}
catch (Exception ex) { throw ex; }
finally { originalImage.Dispose(); bitmap.Dispose(); graphic.Dispose(); GC.Collect(); }
大家帮我看下吧,什么原因呀纠结死我了...